With Diverse-type Art Device Patents (Class 330/1R)
  • Patent number: 5640085
    Abstract: A temperature compensation circuit for a power measurement device includes an input sensor, with a temperature-dependent transmission factor (K.sub.H,T), connected to a signal processor with a temperature-dependent transmission factor (K.sub.S,T). Transmission factor (K.sub.S,T) of the signal processor is inversely proportional to a temperature-dependent reference voltage (U.sub.R,N,T), which is inputted to the signal processor in order to render the combined transmission factor (K.sub.H,T .multidot.K.sub.S,T) temperature independent. To accomplish this, a temperature coefficient value of reference voltage (U.sub.R,N,T) must be equal to the sum of a temperature coefficient value of transmission factor (K.sub.H,T) and a temperature coefficient value of transmission factor (K.sub.S,T). The desired temperature coefficient value of reference voltage (U.sub.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: June 17, 1997
    Assignee: Landis & Gyr Technology Innovation AG
    Inventors: Jan Petr, Erich Jeker
  • Patent number: 5614863
    Abstract: A system for increasing the power efficiency of a balanced amplifier driven antenna arrangement includes a push-pull class B power amplifier circuit which is responsive to a periodic, time varying input signal and generates at least two output signals in response thereto. The arrangement also includes a balanced antenna exhibiting a relatively high impedance at the second harmonic of the input signal. The arrangement further includes at least one transmission line operatively coupled between the power amplifier circuit and the balanced antenna to provide the at least two output signals to the balanced antenna. The at least one transmission line has a length which is one-eighth of the wavelength of the input signal or odd multiples thereof, and thereby reflects back to the power amplifier circuit a substantially short circuit at the second harmonic of the input signal.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: March 25, 1997
    Assignee: AIL Systems, Inc.
    Inventors: John A. Pierro, Richard L. Clouse, Jr., Ronald Rudish
  • Patent number: 5512856
    Abstract: A method and apparatus for compensating for nonlinear responses of capacitive loads using a load reference element.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: April 30, 1996
    Assignee: AT&T Corp.
    Inventor: David B. Doak
  • Patent number: 5125417
    Abstract: A process and device for generating conjugated micrometer to radio frequency range electromagnetic waves and for their amplification. The conjugated waves are generated by establishing in a plasma two waves of the desired frequency, essentially identical in wavelength at in opposite directions and by directing a third electromagnetic wave of essentially the same frequency so that this will enter the plasma at a predetermined wavelength, resulting in a fourth conjugated electromagnetic wave.A high magnification of the intensity of the conjugated wave can be attained. Such conjugated waves can be used in human medicine for concentrating waves at a tumor site. Devices of the invention can be used for the intensification of other waves, such as radar frequency waves.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: June 30, 1992
    Inventor: Isaiah Nebenzahl
  • Patent number: 4358724
    Abstract: A linear solid state servo amplifier operated from a low voltage source and which develops a voltage across the servo motor equal to the source voltage diminished only by the saturation voltages of two of its output transistors has a bridge output stage of complementary transistors and a bridge driver stage of complementary Darlington transistors having as its load a preselected resistor.
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: November 9, 1982
    Assignee: Commercial Shearing, Inc.
    Inventor: Lambert Haner